Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2006 Porsche Cayenne S 4.5 V8, P0441, P0300, P2189

kostelectronics
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8 years 4 months ago - 8 years 4 months ago #12283 by kostelectronics

2006 Porsche Cayenne S 4.5 V8, P0441, P0300, P2189 was created by kostelectronics

Hi Guys and greetings from Switzerland!

I'm fighting with a friend's car. Porsche Cayenne S 4.5 V8.

I grabbed the following DTC's:

P0441 - EVAP incorrect purge flow
P0300 - Random misfire
P2189 - System too lean at idle (Bank2).

I've already changed a bad PCV few months ago, after this, the car ran fine till now.

Now, the engine shakes at idle and under load, misfires happen randomly too.

I suspect a bad (stuck open or Close) tank vent valve for the P0441. Can this cause the other DTC's too (P0300 + P2189)? Or do i fight with more Problems here? does anybody can help me to fix this?

BR Matthias

Last edit: 8 years 4 months ago by kostelectronics.

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Andy.MacFadyen
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8 years 4 months ago - 8 years 4 months ago #12290 by Andy.MacFadyen

Replied by Andy.MacFadyen on topic 2006 Porsche Cayenne S 4.5 V8, P0441, P0300, P2189

You can clamp off or disconnect EVAP hose at the manifold and and block off the hole in the manifold see what happens, BUT what would help is to know the fuel trims short and long term at idle and raised rpm (say 2,000 to 2,500 rpm). If the engine becomes more lean at raised RPM and load it points more towards a faulty MAF sensor.

" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)

Last edit: 8 years 4 months ago by Andy.MacFadyen.

The following user(s) said Thank You: kostelectronics

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kostelectronics
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8 years 4 months ago #12293 by kostelectronics

Replied by kostelectronics on topic 2006 Porsche Cayenne S 4.5 V8, P0441, P0300, P2189

Thank you!
I will check the fuel-trims again. But as i remember, they looked good so far. I will repost after checking!

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cheryl hartkorn
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8 years 4 months ago #12296 by cheryl hartkorn

Replied by cheryl hartkorn on topic 2006 Porsche Cayenne S 4.5 V8, P0441, P0300, P2189

i would say a stuck open purge valve.

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